# Conservation Of Momentum: Question Preview (ID: 18194)

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A big fish swims up on and swallows a small fish at rest. Right after lunch, the momentum of the big fish is
a) the same as before.
b) less than before.
c) more than before.
d) zero.

In the absence of external forces, momentum is conserved in
a) an elastic collision.
b) an inelastic collision.
c) either an elastic or an inelastic collision.
d) neither an elastic nor an inelastic collision.

A big fish coasts up to and swallows a small fish at rest. Right after lunch, the speed of the big fish is
a) the same as before.
b) less than before.
c) more than before.
d) zero.

A pair of spiral galaxies collide and merge to form one larger elliptical galaxy. Astronomers assume that the momentum of the new elliptical galaxy is
a) equal to the sum of the momenta of two spiral galaxies.
b) equal to the difference in momenta of the two spiral galaxies.
c) the same as the momentum of the more massive spiral galaxy.
d) zero.

A piece of clay moving with one unit of momentum strikes and sticks to a heavy bowling ball initially at rest. After the clay sticks, both the clay and ball ideally move with a combined momentum of
a) a little less than one unit.
b) one unit.
c) more than one unit.
d) much less than one unit.

When you say momentum is conserved, you mean that
a) when an impulse acts on an object, its momentum will change.
b) momentum can be stored.
c) when external impulses don’t occur, a system’s momentum remains the same before and after an interaction.
d) when two objects collide, the mass and velocity of each object will not change.

When Jake tosses a ball while standing still on his skateboard, he and his skateboard recoil. If he goes through the motions of tossing the ball, but doesn’t toss it, his net recoil will ideally be
a) the same as if he threw the ball.
b) almost as much as if he threw the ball.
c) very small.
d) zero.

Standing still on a skateboard, you catch a ball tossed horizontally to you. The mass of the ball is one-tenth your mass. Compared with the speed of the caught ball, the speed that both you and the caught ball acquire is
a) the same.
b) one-tenth as much.
c) 10 times as much.
d) 100 times as much.

Nets used to catch falling boulders on the side of rocky hillside roadways are more effective than rigid fences because their breakage is reduced by
a) less impulse of falling rocks.
b) less momentum of falling rocks.
c) more time to change the momentum of falling rocks.
d) less time to change the momentum of falling rocks.

Which of the following scenarios involves the greatest change in momentum?
a) A soccer ball is caught.
b) A soccer ball is thrown.
c) A soccer ball is caught and then thrown.
d) The change in momentum is the same in each case.

When a falling object bounces as it hits the ground
a) the impulse on it is greater than for stopping it.
b) its change in momentum is greater than for stopping.
c) Both of these.
d) None of these.

Which of the following statements is most true about bouncing and impulse, given two objects of the same mass?
a) The object that bounces imparts a greater impulse to whatever it bounces off.
b) The object that bounces undergoes a smaller change in momentum.
c) The object that bounces imparts a smaller impulse to whatever it bounces off.
d) The object that doesn't bounces undergoes no change in momentum.

An example of an inelastic collision is:
a) When two cars crash into each other.
b) When your physics teacher gets mad and throws a piece of clay at the wall, to which the clay sticks.
c) When two atoms collide so violently that they explode.
d) All of these.

An inelastic collision is:
a) A collision in which the colliding objects become distorted, generate heat, and possibly stick together.
b) A collision in which the colliding objects rebound without lasting deformation or the generation of heat.
c) Both of these.
d) Neither of these.

An example of an elastic collision is:
a) When two pool balls collide and fly off in different directions.
b) When two cars crash into each other.
c) When your physics teacher gets mad and throws a piece of clay at the wall, to which the clay sticks.
d) When two atoms collide so violently that they explode.

The definition of an elastic collision is:
a) A collision in which objects rebound without lasting deformation or the generation of heat.
b) A collision in which the colliding objects become distorted, generate heat, and possibly stick together.
c) Both of these.
d) Neither of these.

If a system is a soccer ball, then which of the following forces would be internal to the system?
a) The force of air drag on the ball as it flies through the air.
b) The force of a player's foot on the soccer ball.
c) The force of one atom inside the soccer ball colliding with another atom.
d) The force of gravity on the soccer ball.

Which of the following is true of systems?
a) A system is the object or group of objects a physicist is studying.
b) A system can be as small as a single atom.
c) A system can be as large as a galaxy.
d) All of these.

The definition of the law of conservation of momentum is:
a) In the presence of an external force, the momentum of a system remains unchanged.
b) In the absence of an external force, the momentum of a system remains unchanged.
c) The momentum of a system can never change.
d) Ft=Δ(mv)

Another definition of the law of conservation of momentum is:
a) The product of the mass of an object and its velocity
b) The product of the force acting on an object and the time during which it acts.
c) The momentum of a system before an event involving only internal forces is equal to the momentum after the event.
d) The momentum of a system before an event is equal to the momentum after the event.

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